Change sonobuoy execution mode to parallel

as decided by SIG Standardization/Certification on 2026-03-12

Signed-off-by: Matthias Büchse <matthias.buechse@alasca.cloud>

Author: mbuechse

Tests/README.md

@@ -61,8 +61,8 @@ Replace `SUBJECT` with an arbitrary, but meaningful subject name. Also, please n
 will always use the `current-context` of the kubeconfig and will fail if it isn't set.
 
 Note: Sonobuoy checks (such as CNCF k8s conformance) are known to run for multiple hours (during which
-you won't see feedback). If you want to save wall-time by running the sonobuoy checks in parallel,
-simply add `-a execution_mode=parallel` to the command-line.
+you won't see feedback). In order to save wall-time, the sonobuoy checks will be run in parallel. You
+disable that by simply adding `-a execution_mode=serial` to the command-line.
 
 A report in YAML format will be created.
 

Tests/scs-compatible-kaas.yaml

@@ -9,7 +9,7 @@ variables:
     # working directory for the subject under test
     # (note that we consider each kubernetes branch a test subject of its own)
   - kubeconfig
-  - execution_mode: serial  # alternatively: parallel
+  - execution_mode: parallel  # alternatively: serial
 scripts:
 - executable: ./kaas/sonobuoy_handler/run_sonobuoy.py
   args: run -k {kubeconfig} --scs-sonobuoy-config kaas/scs-sonobuoy-config.yaml -r {subject_root}/sono-results-e2e -c 'cncf-k8s-conformance'  -a '--mode=certified-conformance' --execution-mode {execution_mode}